Steam-engine governor



(No Model.)

Gr. W. BROWN.

STEAM ENGINE GOVERNOR. No. 303.979. Patented Aug. 26, 1884.

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SPECFICATON forming part of Letters Patent No. 303,979, cla-'real lingue?. 2G, 188%.

Application filed February 18, 1884. (No model.)

To @ZZ whom z5 'n1/(Ly concern:

Be it 'known that l, (llmnllv WELD BROWN, ot' Test Newbury, ill the county of Essex, of the Collnnonwealth of Massachusetts, have invented a new and useful lnlprovenlent ill Stealn-lflllginc Governors; and I do hereby declare the saine to he described in the following speciiication and represented ill the accompanying drawing, which is a front view of a governor embodying nly invention, whose natllreis deiilled ill ille clainls hereinafter presented.

lllyinvention relates to that class of governors of which a disk or wllecl ortho ily-wheel of the engine constitutes a part or has applied to revolve wit-ll and be revolved by it other parts of the governor.

In the drawing, A denotes tile wheel, llaving pivoted to it a vibratory lever, B,.l'loln which a pin, a, projects into a slide, C, arranged in the areal slot D of all arln, D, such arnl being pivotcd near its outer end to the wheel and arranged with the lever B ill manner as represented. The areal slot b of the arln D is not concentric with the pivot-col' the lever B, but has its radial center d at a distance laterally i'roln the said that when ille lever B may swing away from the asis of the wheel as the speed oi ille wheel be increased the arnl D shall be moved inwardly laterally on its pivot g', and ill the opposite direction when tllclever B is lnoved toward the axis ofthe wheel. ln practice the arnl D is to be'sllitaoly connected witll the slide-valve ot' the valvecllest of a steam-cir gine cylinder for the throw or movements of the valve to be effected by the lnotiolls inlpartcd i o ille arnl l) by the weighted vihratory level'.

ln the drawing the pill for connecting ille valve-rod to the arln l) is shown at I.

The vibratory lever B is shown oi' angular form in the drawing-that is, as having two arms, g and Il, disposed at an acute angle to each other, each arln being provided with a weight, one ofsncll weights being marked E and the other F, and the latter on the longer arnl. Each weight may be adapted to be adjustable on the arln-tllat is, to slide lengthwise thereon-snch weight bei ng provided w itll a set -scrc-w,

t, to clamp it to t-lle arln.

pivot, ill order` ln Sonie cases the arnl y may be without its weight F and may extend down little, if any, beyond the arnl D; bnt it is better to have the two arms and their two weights to the lever arranged with reference to the wheel and the slotted arm, in manner substantially as represented, in wllicll case the path of centrifugal movement of the weight E, while the wheel may be in revolution, will be approximately radial to the wheel.

A spiral spring, G, attached at one end to the arm g extends therefrom to the wheel A, as shown, Snell spring at its enter end being iixed to the wheel. This spring is to lnove the vibratory lever centripetally relatively to the wheel or contrary direction in which such lever may be moved by its weight E.

The power of the governor to move or throw the slidcwalve, when necessary, when Snell governor llas t-he two weighted arnls arranged with and adapted to the wheel, as represented,

is duc to a combination et" two forces acting together. The weight E, which, for the sake ot' illustration, may be termed the centrifugal weight,77 is so arranged that its path of movement is aplnoxinlately radial to the wlleel, sncll allowing the said weight to move under the influence. ot' centrifugal i'orce while the wheel may be ill revolution. The weight F, however, which, for the sake of illustration, may be terlned the Hinertia weight,77 is so arranged that its path et' moi/.ion is approxilnatcl y parallel to the circumference ot' the wheel, whereby, wllell sncll wheel is in revolution, the weight will oe greatly iniluenced in its nlovelnent by the inertia of sncll weight, and little by centrifugal i'orce ill comparison to what is the case with the weight E.

The action ot' the two weights in governing the speed ot' the engine may be tllns described. As the speed ot'tllcwheel A may increase, the centrifugal i'orce oi' the weight E is balanced, as nearly as may be desired, by the contractile power of the spring. "lhere being in the weight F, while the wheel may be revolving, a due amount ot inertia, this llf'eight, owing thereto, will have a tendency to keep rotating at the velocity given it by the wlleel, and since such weight is tree to nlove in the path oi' its revolution it will. yield to the Vforce oi" itsinertia and change its position relatively to the IOO 2 f t l 303,979

wheel, but the Weight E will be little affected by changes of linertia under the influence of changes of centrifugal force. Now, should the speed of the engine or Wheel slacken, the inert-ia of the Weight F will cause such Weight to advance from its former position, thereby causing the arm D to inove to increase the throw ofthe valve so as to increase the steam to the engine-cylinder. This action will be IO assisted by the diminution of the centrifugal force of the Weight E, such Weight being pulled inwardly by the spring; but should the speed of the engine ortho wheel increase counter effects would occur.

R. H. EDDY, E. B. PRATT. 

